A large data analysis indicates that Medicare Part D had no significant impact on several population-level health indications among enrollees. No significant reductions in the prevalence of fair or poor health status or limitations in activities of daily living were detected 5 years after implementation of Medicare Part D. Furthermore, no changes were seen in emergency department visits, hospital admission or days, inpatient costs, or mortality.

Source: Annals of Internal Medicine, June 16, 2015.